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Period: to
Prenatal Development
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1st month
The fertilized egg moves down the fallopian tube and divides into more and more cells. It reaches the uterus about 3–4 days after fertilization. The dividing cells then form a ball that floats free in the uterus for about 2–3 days. -
2nd month
Buds for arms and legs develop. The neural tube begins forming. The neural tube will later form the brain, spinal cord, and major nerves The heart has formed. Webbed fingers and toes develop. The arms bend at elbows. External ears, eyes, eyelids, liver, and upper lip have begun forming. -
3rd month
Fingers and toes are no longer webbed. Bones begin hardening. Skin and fingernails begin to grow. They can start to determine female or male. The fetus begins making spontaneous movements. Kidneys start making urine. Early sweat glands appear. Eyelids are fused together -
4th month
Hair begins to grow. The prostate gland begins developing in male fetuses. Ovaries move down from the abdomen to the pelvic area in female fetuses. Hundreds of thousands of eggs are forming in the ovaries in female fetuses. -
5th month
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6th month
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7th month
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8th month
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9th month
